Modified file reload dialog

[kolcz]

Description

This PR addresses issue #702. In this PR I added prompt dialog to reload file buffer or keep buffer unchanged when file is edited externally.

Changes Made

• Added message box with prompt,
• Added function omitModifications in which modifiedTime is updated to file info last modified time and temporary flag is set,
• Added setting temporary flag to false after reload. This changes temporary flag when changes are ommited and then reloaded,
• Added signal ScintillaNext::modified to URLFinder to findURL after file reload.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change
• Documentation update

Testing - on Windows 11 and Debian 12 bookworm

• If file is modified externally and NotepadNext gets focus prompt dialog is shown,
• If "Yes" option is selected file is reloaded,
• If "No" option is selected file keep current content and file icon is changed to red
• If "No" option is selected after hiding window and showing it again prompt dialog isn't shown,
• If "No" option is firstly selected and then file is modified again propmt dialog is shown again,
• If file icon is red and gets reloaded it changes,
• If file is reloaded links are highlighted.

Additional Note

This is my first contribution to this project.

[kolcz]

@dail8859 could you check if everything is ok with runners? I builded code on my fork and all checks passed (kolcz#2). I'm not sure, but runner time limit could be exceeded. I can try to commit and reverse some changes to re-run build workflows, but could you first check it?

[dail8859]

@kolcz Appreciate your time and effort and working through these changes! ❤️