5-bit brightness Pixel buffer (instead of 8bit PWM)
Simple program (just compile with cc locally) to generate brightness-to-PWM table
pwmtable: also generates backwards table now
non-linear energy to brightness map table, tweaked default params
Reduced text overlay buffer to one strip of around the tube of rowsPerGlyph (7) height, which saves 114 Bytes with a 240 LED strip. Note that this change also removes the "raise_text_by" settings (did not look nice, never used)
Works with 11 rows on v0.2.2 firmware, despite several memory optimizations.
Works with 18 levels of 13 LEDs again with Spark FW v0.2.2! Added conditionals to leave out cheerlights and digitalstrom part of the code to save memory. Also moved number of LED config constants to the very beginning of the file, added explanation.