Ignore changes to codeStyles and stray files

[dlvoy]

When app is built from master branch, gradle checks if repository is clean and does not have uncommitted changes.
Unfortunately, some versions of Android Studio auto-magically update files inside .idea/codeStyle preventing user from building stable versions of app.

To prevent that, function that check if all changes are commited is extended to ignore:

• all changes inside .idea/codeStyle
• all new files not yet added/known to GIT

while still not allowing changes/staged additions to other parts of the code, if built from master

[codecov]

Codecov Report

Merging #3 into dev will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev       #3      +/-   ##
============================================
- Coverage     10.12%   10.12%   -0.01%     
+ Complexity     1092     1091       -1     
============================================
  Files           753      753              
  Lines         34725    34725              
  Branches       4895     4895              
============================================
- Hits           3517     3516       -1     
  Misses        30956    30956              
- Partials        252      253       +1     

Impacted Files	Coverage Δ	Complexity Δ
...a/info/nightscout/androidaps/utils/SntpClient.java	91.56% <0.00%> (-1.21%)	12.00% <0.00%> (-1.00%)

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