fix 'micro' char in font
fix draw STOP distance in frequency field
fix x position calc in plot_into_index
fix frequencies delta defined as int in plot.c
fix frequencies defined as int in ui.c
Set menuitem_t size align as WORD (more compact on flash)
Add data to menuitem_t (more easy use callback functions, and save its sizing)
Rewrite some ui callback functions for use data field
More better look infinity and delta symbols
Fix grid sizing in update_grid (broken after frequency0 and frequency1 set as uint)
Rework display spi driver:
use DMA for read, write
add blitBitmap functions
Use DMA for color fill
More correct SPI bus control
Move color definitions to nanovna.h
Some code optimization for speed and size (save about 3k bytes)
Change grid Y resolution to 10
Fix convert from float to int (fix some rounding errors on plot)
Disable unused HAL serial
Change battery icon
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TT