* Refactor EInkDisplay
A lot of variant specific code is merged, with the macros pushed to the respective variant.h files.
"Dynamic Partial" code has been purged, pending a rewrite.
* fix: declare class only if USE_EINK, init all members
* refactor: move macros to platformio.ini
Responds to https://github.com/meshtastic/firmware/pull/3299#issuecomment-1966425926
* fix: EInkDisplay::connect() references old macros
Usage was in a block of variant-specific code, which had been intentionally left untouched.
* fix: remove duplicate macros from variant.h
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Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
