Prepare to release the crate (as a crate, not github release)

[Amjad50]

Some cleanup

• renamed the crates to plastic (UI) and plastic_tui for tui
• updated docs and public API
• removed unused code and make it easier to use the API

[codecov]

Codecov Report

Attention: Patch coverage is 15.78947% with 16 lines in your changes missing coverage. Please review.

Project coverage is 81.86%. Comparing base (619b588) to head (5c08e2e).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
plastic_core/src/controller/mod.rs	16.66%	5 Missing ⚠️
plastic_core/src/nes.rs	0.00%	5 Missing ⚠️
plastic_core/src/apu2a03/mod.rs	0.00%	2 Missing ⚠️
plastic_core/src/ppu2c02/mod.rs	0.00%	2 Missing ⚠️
plastic_core/src/common/save_state.rs	0.00%	1 Missing ⚠️
plastic_core/src/cpu6502/mod.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   81.83%   81.86%   +0.03%     
==========================================
  Files          37       37              
  Lines        5351     5349       -2     
==========================================
  Hits         4379     4379              
+ Misses        972      970       -2     

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