libs/txt: implement txt_render_fragment_offsetted() variant

Instead of rigid txt_align_t enums to specify how the text is
aligned relative to the x/y coordinates, you specify float
offsets in normalized coordinates -1..+1 allowing fine-grained
control of the offsets.

modules/asc will use this to automatically adjust the offsets
when requested, so x/y coordinates may be varied dynamically
using taps with the text automagically adjusting its offset to
try stay in-fragment.

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