remove font converting; too many edge cases to code around

Switch to using PNG fonts, add support for more font pages (fpv-wtf#138)

* add libspng 0.7.3

* working PNG support

* cleanup

* split font code into own file

* add font converter

* swap to PNG fonts

* swap ipk to contain png

* builds

* Fix comparison error

* bump version for testing

* Rework font loading:

- No longer require whitelist of fonts; take FC identifier and use that directly. Avoids needing to release a version to support a new FC; users could put fonts on an SD and away they go.
- Also, to support the above - fall back to default font variant if no FC specific variant found (previously impossible as we bundled a font for all supported FCs)
- Support fallback to bf as a font name; betaflight uses BTFL as it's identifier; we used bf in it's font filenames previously

* debugs

* convert quicksilver font

* Switch to sneaky europa and switch to preferred font names (fc identifier for bf/ultra - btfl/ultr)

* Add fallback for ultra

* Fix comparisons

* reorder font loading - /blackbox before the bundled fonts; means you can put fonts (via adb push) into /blackbox and then not need to worry about putting them on SD

* font convert debugging + load order amend so BTFL/ULTR fallback works

* Fix infinite reloading of fonts caused by lowercasing the FC variant

* Fix debug

* latest ver of sneakyfpv fonts

* update ardu and generic font

* revert accidental gtar

* revise fonts section in readme

* Remove -dev from version ahead of release

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Co-authored-by: bri3d <[email protected]>

also removed font_hd_2.bin

Merge pull request fpv-wtf#131 from benlumley/framebuffer-alt

Change framebuffer handling to avoid the reboot

Adds support for QUICKSILVER + new fonts for Kiss Ultra

Non functionali improvements to config

make compress_osd and rec_enabled defaults

bump versions

docs and version bump

New betaflight hd (fpv-wtf#87)

* initial pass at new Betaflight resolution setting support

* switch defines to enum

* move displayport commands to an enum as well

* add compatibility with noncompressed mode

* make Betaflight HD mode disable-able for the discerning user.

* fix config defaults

* bump control

Bump control