Add commonly used font ranges when building font

[Nukoooo]

Without this imgui just shows ????? when a string contains any CJK characters

[angelfor3v3r]

Adding some notes here for later:
Dear ImGui v1.92.0 added better font support, instead we can merge CJK fonts into the primary font. The AddFontFromFileTTF function size is optional now (not sure what comes first: FontSizeBase or the font size argument).

There is also this in ImFontConfig:

const ImWchar*  GlyphExcludeRanges;     // NULL     // Pointer to a small user-provided list of Unicode ranges (2 value per range, values are inclusive, zero-terminated list). This is very close to GlyphRanges[] but designed to exclude ranges from a font source, when merging fonts with overlapping glyphs. Use "Input Glyphs Overlap Detection Tool" to find about your overlapping ranges.

which we could make use of.