New Rule: UnnecessarySafeCall

[cortinico]

Adding the UnnecessarySafeCall rule, as suggested in #2572

[codecov-io]

Codecov Report

Merging #2574 into master will increase coverage by 0.06%.
The diff coverage is 38.88%.

@@             Coverage Diff              @@
##             master    #2574      +/-   ##
============================================
+ Coverage     25.11%   25.17%   +0.06%     
- Complexity      392      393       +1     
============================================
  Files           378      378              
  Lines          7391     7399       +8     
  Branches       1221     1222       +1     
============================================
+ Hits           1856     1863       +7     
- Misses         5404     5405       +1     
  Partials        131      131              

Impacted Files	Coverage Δ	Complexity Δ
...rturbosch/detekt/rules/bugs/UnnecessarySafeCall.kt	35.29% <35.29%> (ø)	1.00 <1.00> (?)
...sch/detekt/rules/providers/PotentialBugProvider.kt	100.00% <100.00%> (ø)	2.00 <0.00> (ø)
...kotlin/io/gitlab/arturbosch/detekt/DetektPlugin.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
.../arturbosch/detekt/internal/GradleProjectChecks.kt

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