Refactor settings menu to use SwitchSetting class & persist settings localstorage - Refactor Save & Load logic (#251)

This pull request refactors the configuration and settings management
system, replacing the monolithic `ConfigModal` class with a modular and
scalable `ConfigMenu` system. It introduces a new `SwitchSetting`
abstraction for managing individual settings and updates the
`GlobalContext` to integrate the new configuration system. The most
important changes include the removal of the old `ConfigModal`, the
introduction of `ConfigMenu` and `SwitchSetting`, and the integration of
these changes into the `GlobalContext`.

### Refactoring of Configuration System:

* **Removal of `ConfigModal`**: The `ConfigModal` class and its
associated functionality were removed, simplifying the `src/config.ts`
file. This includes the deletion of methods for creating modals,
managing settings, and handling shortcuts.

* **Introduction of `ConfigMenu`**: A new `ConfigMenu` class was added
in `src/config_menu/config_menu.ts`. This class modularizes settings
management, supports listeners for changes, and uses a more scalable
approach to handle configuration switches.

* **Switch Abstraction with `SwitchSetting`**: The `SwitchSetting` class
was added to encapsulate individual settings, including their
persistence, temporary state, and UI rendering. This abstraction allows
for easier addition and management of settings.

* **Switch Factory**: A `switch_factory` was introduced to centralize
the creation of all switches, such as enabling tooltips and using TCP
Reno. This ensures consistent initialization and behavior of switches.

### Integration into `GlobalContext`:

* **Integration of `ConfigMenu`**: The `GlobalContext` class now
includes a `ConfigMenu` instance. It initializes the menu, listens for
changes, and saves settings to local storage when updates occur. This
replaces the previous direct settings management in `GlobalContext`.
[[1]](diffhunk://#diff-0cd594dddd6a9f2e3e26afebbb92716434437d7001c2416252aa7531e7f2b8d4L28-R34)
[[2]](diffhunk://#diff-0cd594dddd6a9f2e3e26afebbb92716434437d7001c2416252aa7531e7f2b8d4R48-R54)

* **Refactoring of Save Operations**: All calls to `saveToLocalStorage`
in `GlobalContext` were replaced with a new `this.saveToLocalStorage`
method, ensuring consistent behavior and integration with the new
configuration system.
[[1]](diffhunk://#diff-0cd594dddd6a9f2e3e26afebbb92716434437d7001c2416252aa7531e7f2b8d4L88-R89)
[[2]](diffhunk://#diff-0cd594dddd6a9f2e3e26afebbb92716434437d7001c2416252aa7531e7f2b8d4L150-R151)
[[3]](diffhunk://#diff-0cd594dddd6a9f2e3e26afebbb92716434437d7001c2416252aa7531e7f2b8d4L161-R162)This
pull request refactors the configuration management system by replacing
the `ConfigModal` class with a more modular and extensible `ConfigMenu`
system. The new implementation introduces a switch-based architecture
for managing settings, improving code maintainability and scalability.
Below are the most important changes grouped by theme:

### Refactoring Configuration Management:
* Removed the `ConfigModal` class, including all its methods and
properties, and replaced it with the `ConfigMenu` class, which uses a
modular architecture to manage settings. (`src/config.ts` -
[[1]](diffhunk://#diff-c3095d5010e65c52737a98a5d618ea24049ebe90c8470752426081d70ed6e012L1-L311)
`src/config_menu/config_menu.ts` -
[[2]](diffhunk://#diff-c3f37150933d9200129781d64be0a8fa84b355627ddf96e66bb203f8956c5968R1-R168)
* Introduced the `SwitchSetting` abstract class to encapsulate the
behavior of individual settings, allowing for easy addition of new
settings. (`src/config_menu/switches/switch.ts` -
[src/config_menu/switches/switch.tsR1-R60](diffhunk://#diff-da65f25c5fd3cdb260e441f5b6ede48a06a7119b3101872ebb885aa88d6ca2f9R1-R60))

### Modular Settings Implementation:
* Added the `EnableTooltipsSwitch` and `UseTcpRenoSwitch` classes, which
extend `SwitchSetting` to handle specific settings like enabling
tooltips and using TCP Reno.
(`src/config_menu/switches/enable_tooltips.ts` -
[[1]](diffhunk://#diff-6b9a4f91978bdeec8a40150007eeec476b123dd45dedcfb0576e78d61e5946d8R1-R13)
`src/config_menu/switches/tcp_reno.ts` -
[[2]](diffhunk://#diff-a8428ef14b05121c8bbe8d76245494785f2f5039577665be02cbd00d26919e5eR1-R11)
* Created a `createAllSwitches` factory function to initialize all
available switches dynamically.
(`src/config_menu/switches/switch_factory.ts` -
[src/config_menu/switches/switch_factory.tsR1-R8](diffhunk://#diff-725b05ce0cf5670a609b6a327788a2de4b0e9fc918ea85d25e8de41b4454b296R1-R8))

Author: pgallino