Clean up gradle, some tiny code changes

[TacoTheDank]

1st commit

• Update Gradle 5.4.1 -> 5.6.2

2nd commit

• Clean up and reorganize build.gradle files, reorganize dependencies
• Update coroutines 1.2.1 -> 1.2.2
• kotlin-stdlib-jdk7 -> kotlin-stdlib-jdk8

3rd commit

• Add an .editorconfig
• Adjust the codestyle to the .editorconfig

4th commit

• Delete redundant things in debug manifest
• Replace a guard clause with Kotlin's function call
• Close empty XML bodies
• Rename unused parameter to _

5th commit

• Migrate App to AppCompat

[jimmod]

I've fixed the lint issue, can you resolve the conflict

[TacoTheDank]

Resolved

[codecov[bot]]

Codecov Report

Merging #55 into master will increase coverage by 1.21%. The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master      #55      +/-   ##
============================================
+ Coverage     64.73%   65.94%   +1.21%     
  Complexity        4        4              
============================================
  Files            38       38              
  Lines           930      966      +36     
  Branches        142      142              
============================================
+ Hits            602      637      +35     
- Misses          226      227       +1     
  Partials        102      102

Impacted Files	Coverage Δ	Complexity Δ
.../com/jim/sharetocomputer/gateway/ActivityHelper.kt	63.15% <ø> (ø)	0 <0> (ø)	:arrow_down:
...va/com/jim/sharetocomputer/ui/send/SendFragment.kt	78.57% <ø> (ø)	0 <0> (ø)	:arrow_down:
.../jim/sharetocomputer/ui/receive/ReceiveFragment.kt	100% <ø> (ø)	0 <0> (ø)	:arrow_down:
...ain/java/com/jim/sharetocomputer/QrCodeFragment.kt	0% <ø> (ø)	0 <0> (ø)	:arrow_down:
...om/jim/sharetocomputer/ui/setting/AboutFragment.kt	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...in/java/com/jim/sharetocomputer/ext/ActivityExt.kt	25% <0%> (ø)	0 <0> (ø)	:arrow_down:
...a/com/jim/sharetocomputer/ui/FragmentNavigation.kt	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...haretocomputer/webserver/WebServerMultipleFiles.kt	78.02% <0%> (ø)	0 <0> (ø)	:arrow_down:
...ain/java/com/jim/sharetocomputer/ActionActivity.kt	87.5% <100%> (ø)	0 <0> (ø)	:arrow_down:
...in/java/com/jim/sharetocomputer/DownloadService.kt	73.03% <100%> (+1.94%)	0 <0> (ø)	:arrow_down:
... and 13 more

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