[tool] Add Settings and Reporter

[at15]

• refactor Reikac, use a Command class for JCommander, which extends CompilerSetting
• allow set log4j logging level programmatically
• allow using StringWriter to ConsoleReporter's original writer, so we can buffer all the report to a single string and compare with stored output
  • [ ] TODO: the final \n
• add flag setLogToStdout to log regardless of reporter setting

[codecov-io]

Codecov Report

Merging #45 into master will increase coverage by 0.79%. The diff coverage is 54.54%.

@@             Coverage Diff              @@
##             master      #45      +/-   ##
============================================
+ Coverage     31.94%   32.74%   +0.79%     
- Complexity       79       93      +14     
============================================
  Files            41       41              
  Lines          1036     1075      +39     
  Branches        104      104              
============================================
+ Hits            331      352      +21     
- Misses          678      698      +20     
+ Partials         27       25       -2

Impacted Files	Coverage Δ	Complexity Δ
...java/me/at15/reika/compiler/reporter/Position.java	35.29% <0%> (-14.71%)	2 <0> (ø)
...c/main/java/me/at15/reika/compiler/phases/AST.java	52.17% <0%> (-7.83%)	5 <0> (ø)
...j/src/main/java/me/at15/reika/compiler/Reikac.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...main/java/me/at15/reika/compiler/reporter/Err.java	66.66% <0%> (ø)	1 <0> (ø)	:arrow_down:
...main/java/me/at15/reika/compiler/phases/Phase.java	100% <100%> (ø)	5 <4> (+3)	:arrow_up:
...ava/me/at15/reika/compiler/parser/SyntaxError.java	90.9% <100%> (ø)	4 <0> (ø)	:arrow_down:
...a/me/at15/reika/compiler/util/CompilationUnit.java	90.9% <100%> (+0.9%)	3 <1> (+1)	:arrow_up:
...a/me/at15/reika/compiler/parser/ErrorListener.java	84.21% <100%> (+4.21%)	9 <5> (+1)	:arrow_up:
...main/java/me/at15/reika/compiler/phases/ANTLR.java	77.5% <100%> (+5%)	9 <4> (+2)	:arrow_up:
...e/at15/reika/compiler/setting/CompilerSetting.java	100% <100%> (+100%)	2 <1> (+2)	:arrow_up:
... and 5 more

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[at15]