Able to read .otf file and export to fnt file

[andy840119]

Implementation of #521
.
Should have task in the right-side menu with progress to change all .otf file into .cached file.
.
https://github.com/vladimirgamalyan/fontbm
Also find the tool to convert convert .ttf to .fnt written in C++
Not really should write a new one or just wrap it.
Also seems not support .otf font type.

[andy840119]

https://github.com/cyotek/Cyotek.Drawing.BitmapFont
Or see this project.
It's a project for rendering text to openGL.
Might need to make a check is support .otf file and able to save as image?
.
Update:
This package is just for reading the .fnt format.
Works like SharpFNT

[andy840119]

Also need to check UpdateProgressNotification to see how to customize progress and complete notification into NotificationOverlay

[andy840119]

https://github.com/willmexe/Game-Engine-CS/tree/main/sdl
not really sure this project will got help?

[andy840119]

https://www.nuget.org/packages/FontInfo/1.1.1
Find NuGet to parse .ttf / .otf file.
But seems not able to convert to .fnt file

[andy840119]

https://github.com/AuroraBertaOldham/SharpFNT
Oops, almost forgot this one.
Should check if this shit is able to remove character first.
Will help a lot if can do that (for making customize font in beatmap).
And should be able to get the stream in FontStore.

[andy840119]

TTFGlyphStore has been implemented in #794
Can close this issue because render speed is not that slow so we don't need to change to .fnt in the first use.
And other parts duplicated with #787