Create HgStatusCommand using appropriate builder structure.

 *Change HgStatusCommand constructors call.
 *Fix for IDEA-101722
Change checking myProject for null with  if- statement to assertion.
Add annotation @Nullable for target revision argument
Add assertion if there are no branches to update or to merge with.
Refactor HgTagBranchCommand. Handle errors when load branches for action dialogs.

*Remove unnecessary usage of Consumers in HgTagBranchCommand method execution.
*Check result of command execution and handle errors.
new bg for darcula
new bg for darcula
let it be Reveal log on all platforms
onSearchFieldUpdated should be called on popup open as well
IDEA-101755 Indent lines and tear line are too bright
fix urls test (windows specific)
fix urls test (windows specific)