To py3

[ppizarror]

• Conversion from py2 (deprecated) to py3.
• Added typing to the whole library.
• Added PyInstaller support, fixes pygame-menu doesn't see font after compiling using pyinstaller #212, Can't create .exe with pyinstaller when using pygame_menu #264.
• Path improvements.
• Added Pathlib to BaseImage and Image widget.

[codecov]

Codecov Report

Merging #266 (7d5fba8) into master (4caceec) will increase coverage by 0.42%.
The diff coverage is 96.86%.

@@            Coverage Diff             @@
##           master     #266      +/-   ##
==========================================
+ Coverage   88.18%   88.60%   +0.42%     
==========================================
  Files          45       44       -1     
  Lines        5474     5898     +424     
==========================================
+ Hits         4827     5226     +399     
- Misses        647      672      +25     

Impacted Files	Coverage Δ
pygame_menu/__init__.py	100.00% <ø> (ø)
pygame_menu/widgets/core/__init__.py	100.00% <ø> (ø)
pygame_menu/widgets/selection/__init__.py	100.00% <ø> (ø)
pygame_menu/widgets/widget/__init__.py	100.00% <ø> (ø)
pygame_menu/widgets/selection/highlight.py	94.44% <83.33%> (-5.56%)	⬇️
pygame_menu/widgets/selection/left_arrow.py	94.73% <85.71%> (-5.27%)	⬇️
pygame_menu/widgets/selection/none.py	90.90% <85.71%> (-9.10%)	⬇️
pygame_menu/widgets/selection/right_arrow.py	94.73% <85.71%> (-5.27%)	⬇️
pygame_menu/examples/multi_input.py	84.52% <91.66%> (-1.20%)	⬇️
pygame_menu/widgets/widget/textinput.py	75.38% <91.71%> (+1.55%)	⬆️
... and 37 more

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[lgtm-com]

This pull request introduces 2 alerts when merging f49bc51 into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import
• 1 for Redundant assignment

[lgtm-com]

This pull request introduces 1 alert when merging 2dd959d into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 1 alert when merging 888934e into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 1 alert when merging fe26f16 into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 1 alert when merging 2e3bdae into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 1 alert when merging ce37e93 into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 1 alert when merging b2e99ee into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import

[lgtm-com]

This pull request introduces 1 alert when merging 7d5fba8 into 4caceec - view on LGTM.com

new alerts:

• 1 for Unused import