final calc improvements; fix emulator #,* keys

[Ser2808]

input/drivers/pygame_input.py -change KEY_ANSWER,KEYHASH keys to KEY*, KEY_# for use in emulator;

apps/utils/calculator/main.py -add help page; -add degree/radian; -make keys consistent (left=Exit, F5=Help,...); -change current row to blinking cursor; -change names of operation (^2->square,...); -add add/sub_memory, change memory to use result; -set row0=first number, row3=second number; -no rollover on mode;

[codecov[bot]]

Codecov Report

Merging #163 into devel will decrease coverage by 0.12%. The diff coverage is 14.01%.

@@            Coverage Diff             @@
##            devel     #163      +/-   ##
==========================================
- Coverage   41.35%   41.22%   -0.13%     
==========================================
  Files         253      253              
  Lines       21083    21175      +92     
==========================================
+ Hits         8718     8729      +11     
- Misses      12365    12446      +81

Impacted Files	Coverage Δ
input/drivers/pygame_input.py	0% <ø> (ø)	:arrow_up:
apps/utils/calculator/main.py	23.27% <14.01%> (-4.07%)	:arrow_down:

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[CRImier]

Thank you!