Refactor of examples/game_of_life

[jesper-olsen]

Description

Refactor of examples/game_of_life as follows:

1. Moved conway grid logic from main.rs to cell.rs - to better separate model & yew code.
2. Renamed cell.rs to conway.rs
3. Simplified and removed some codeblocks - e.g. directly count neighbours, instead of retuning them so that they can be counted...

Functionality is unchanged, LOC is reduced from 282 to 210 (~25%).

Fixes #0000

Checklist

• I have reviewed my own code
• I have added tests

[github-actions]

Size Comparison

Details

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
async_clock	99.195	99.195	0	0.000%
boids	168.005	168.005	0	0.000%
communication_child_to_parent	91.554	91.554	0	0.000%
communication_grandchild_with_grandparent	102.578	102.578	0	0.000%
communication_grandparent_to_grandchild	97.573	97.573	0	0.000%
communication_parent_to_child	87.470	87.470	0	0.000%
contexts	103.686	103.686	0	0.000%
counter	84.274	84.274	0	0.000%
counter_functional	84.623	84.623	0	0.000%
dyn_create_destroy_apps	87.274	87.274	0	0.000%
file_upload	98.170	98.170	0	0.000%
function_memory_game	170.059	170.059	0	0.000%
function_router	336.237	336.237	0	0.000%
function_todomvc	162.450	162.450	0	0.000%
futures	236.567	236.567	0	0.000%
game_of_life	104.512	104.362	-0.149	-0.143%
immutable	193.274	193.274	0	0.000%
inner_html	79.920	79.920	0	0.000%
js_callback	107.411	107.411	0	0.000%
keyed_list	195.425	195.425	0	0.000%
mount_point	83.287	83.287	0	0.000%
nested_list	112.415	112.415	0	0.000%
node_refs	90.649	90.649	0	0.000%
password_strength	1782.874	1782.874	0	0.000%
portals	92.442	92.442	0	0.000%
router	305.597	305.597	0	0.000%
suspense	111.410	111.410	0	0.000%
timer	88.542	88.542	0	0.000%
timer_functional	94.578	94.578	0	0.000%
todomvc	142.697	142.697	0	0.000%
two_apps	85.640	85.640	0	0.000%
web_worker_fib	134.121	134.121	0	0.000%
web_worker_prime	184.396	184.396	0	0.000%
webgl	82.856	82.856	0	0.000%

✅ None of the examples has changed their size significantly.

[Madoshakalaka]

thanks for the contribution