ignore line spacing flag does not work

[ZERICO2005]

details mentioned here:
#661

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Doing a search on github for fontlib_SetFont https://github.com/search?q=fontlib_SetFont&type=code
I found these results:

• fontlib_SetFont(font, 0): at least 25 times
• fontlib_SetFont(font, FONTLIB_IGNORE_LINE_SPACING): used only once in https://github.com/the-real-mcarn/stopresisting-ti84

So it seems like most users did not use the FONTLIB_IGNORE_LINE_SPACING flag, but fontlib_SetFont(font, 0) has a 99.6% chance as being treated as fontlib_SetFont(font, FONTLIB_IGNORE_LINE_SPACING)

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My proposal is to:

• Have fontlib_SetFont ignore line spacing with a 100% chance instead of a 99.6% chance.
• Create a new routine (fontlib_LoadFont or etc) that properly handles the flags.
• Discourage fontlib_SetFont in new code
• Rename fontlib_SetFont to fontlib_Deprecated or etc, and have #define fontlib_SetFont fontlib_Deprecated with a warning so developers can update their code