Added classPath argument to detekt plugin, fixed detected issues

[petertrr]

Additional checks involving type resolution are activated if detekt is aware of classpath. It then involves kotlin compiler to create more complex stuff than just AST. This configuration discovered couple of dozens of unsafe !! in our code.

Fixme:

• there are currently a lot of errors like unresolved reference in build logs, though everything seems to be working fine. - solved with detekt version update (?)
• the only limitation left is that detekt doesn't split classpath correctly on windows (warning: classpath entry points to a non-existent location: C when path starts with C:\), but nothing can be done on our side

[codecov]

Codecov Report

Merging #238 into master will increase coverage by 0.07%.
The diff coverage is 61.03%.

@@             Coverage Diff              @@
##             master     #238      +/-   ##
============================================
+ Coverage     81.25%   81.33%   +0.07%     
- Complexity      957      959       +2     
============================================
  Files            50       50              
  Lines          2524     2524              
  Branches        788      789       +1     
============================================
+ Hits           2051     2053       +2     
+ Misses          190      187       -3     
- Partials        283      284       +1     

Flag	Coverage Δ	Complexity Δ
#unittests	81.33% <61.03%> (+0.07%)	959.00 <3.00> (+2.00)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
.../cqfn/diktat/ruleset/rules/BlockStructureBraces.kt	82.65% <0.00%> (-1.03%)	53.00 <0.00> (ø)
...kotlin/org/cqfn/diktat/ruleset/rules/EmptyBlock.kt	66.66% <ø> (ø)	10.00 <0.00> (ø)
...in/org/cqfn/diktat/ruleset/rules/EnumsSeparated.kt	91.42% <ø> (ø)	16.00 <0.00> (ø)
...kotlin/org/cqfn/diktat/ruleset/rules/FileNaming.kt	9.52% <0.00%> (+0.82%)	2.00 <0.00> (ø)
...kotlin/org/cqfn/diktat/ruleset/rules/LineLength.kt	87.12% <ø> (ø)	74.00 <0.00> (ø)
...in/org/cqfn/diktat/ruleset/rules/WhiteSpaceRule.kt	79.67% <ø> (ø)	110.00 <0.00> (ø)
.../cqfn/diktat/ruleset/rules/files/BlankLinesRule.kt	100.00% <ø> (ø)	12.00 <0.00> (ø)
...rg/cqfn/diktat/ruleset/rules/files/NewlinesRule.kt	87.90% <ø> (ø)	75.00 <0.00> (ø)
...at/ruleset/rules/identifiers/LocalVariablesRule.kt	92.06% <ø> (ø)	32.00 <0.00> (ø)
.../kotlin/org/cqfn/diktat/ruleset/utils/KDocUtils.kt	6.66% <ø> (ø)	0.00 <0.00> (ø)
... and 19 more

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[orchestr7]

lgtm