Switch font

[PringlesGang]

• Adds support for the LCC Switch fonts
• Add position member to ProcessedTextGlyph
• Refactor text functions
• Refactor Label class

A large part of this PR is refactoring text and label functions. The Switch font is the first font type implemented in Impacto that does not have fixed cell dimensions for each glyph in the sprite sheet. A lot of the internal code depended on the position of the glyph to be the top left of its DestRect, which is thus no longer the case, so all these instances had to be fixed.

When testing, make sure all of the labels in all of the menus still behave properly. I had to touch just about all of them.

This PR was not built on top of the Switch assets PR, so to test you'd need to manually edit both fonts.lua files to have the default fonts resemble this:

["Default"] = {
    Type = FontType.EdgeDetectedSingleVariableWidthSheet,
    Sheet = "Font",
    BinaryPath = <FontBinaryAssetPath>,
    BitmapEmWidth = 53,
    BitmapEmHeight = 53,
    DifferenceFactor = 0.8,
    IntensityShift = 0.48,
    AlphaShift = 0.36,
},

with the Font entry in sprites.lua altered accordingly.

[KKhanhH]

use the concept or extend it if needed