* replace strlen with strnlen
* avoid static variable in getFontInfo
* remove legacy code in drawCharacter (new code works well)
it works for me, let's ship it ;-)
* centralize font selection logic into getFontInfo()
* removed unneeded parameter "numberOfChars" from drawText()
* new file: wled_fonts.hpp to centralize font management logic (inline)
* only compile wchar16ToCodepage437 when WLED_ENABLE_FULL_FONTS
* minor cleanup