Support build android and ios executables

[NyaMisty]

Mobile build with test

Change to ubuntu + mac

Fix build.py

Fix android build

Cleanup the appveyor.yml

[codecov]

Codecov Report

Merging #212 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   32.17%   32.17%           
=======================================
  Files          10       10           
  Lines         491      491           
=======================================
  Hits          158      158           
  Misses        303      303           
  Partials       30       30

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[NyaMisty]

I've changed the skip_branch_with_pr and skip_tag option.
As the appveyor build now builds more platforms, we should make it build every commit.
Also many PR has some feature needs to be tested, and providing them a safe and accessible binary test build will make everyone happy :)

[shawn1m]

What are these android and ios builds actually for?

[NyaMisty]

Well users can run binaries on iOS if they jailbreaked, and android user can use the overture in termux. Android and iOS do lack a good DNS dispatcher, and most vpn software solution can't uses the DoT and DoH, so some users need overture. And I've also tested the iOS compiled binary, which works flawlessly on my device.

[shawn1m]

Merged. Thanks!