Farsi support

[PatrickLerner]

very wip; basically it's RTL emulation on terminal level due to lack of terminal support (at least in alacritty which is my only target);

currently buggy:

• multilines are broken incorrectly (at least cursor moves)
• cetain fonts will not render too well (Fira Code 😢)

[codecov]

Codecov Report

❌ Patch coverage is 77.45665% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/ui.rs	0.00%	34 Missing ⚠️
src/rtl.rs	97.34%	3 Missing ⚠️
src/app.rs	0.00%	1 Missing ⚠️
src/tts.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/dictionary/mod.rs	100.00% <100.00%> (ø)
src/dictionary/tests.rs	100.00% <100.00%> (ø)
src/input/mod.rs	100.00% <100.00%> (+2.43%)	⬆️
src/input/tests.rs	100.00% <100.00%> (ø)
src/app.rs	0.00% <0.00%> (ø)
src/tts.rs	0.00% <0.00%> (ø)
src/rtl.rs	97.34% <97.34%> (ø)
src/ui.rs	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

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