Issue #4035: Rename STMT in BlockOption class to STATEMENT

[subkrish]

Issue #4035

Renamed STMT in BlockOption class to STATEMENT. Also made subsequent changes in the EmptyBlockCheck, EmptyBlockCheckTest, config_blocks.xml, property_types.xml and messages.properties.

[romani]

two more files to update:
checkstyle/src/xdocs/config_blocks.xml
checkstyle/src/xdocs/property_types.xml

please search in repo for all "stmt". Not all probably should be changed , but should be reviewed for sure.

[subkrish]

I did update config_blocks.xml. I will make necessary changes for property_types.xml

[subkrish]

Done.

@romani @rnveach Please review.

[rnveach]

@subkrish Please rebase on latest master so we can test a travis fix.

[subkrish]

Rebased on latest master. Done.

[codecov-io]

Codecov Report

Merging #4482 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #4482   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         285     285           
  Lines       15324   15324           
  Branches     3489    3489           
======================================
  Hits        15324   15324

Impacted Files	Coverage Δ
...wl/tools/checkstyle/checks/blocks/BlockOption.java	100% <100%> (ø)	⬆️
...ools/checkstyle/checks/blocks/EmptyBlockCheck.java	100% <100%> (ø)	⬆️

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