statecheck: added support for STATES This removes `STATES` from `state.py` and adds support to `statecheck` class to handle its features. `getrepostate()` function is modified accordingly. This adds a method 'cmdutil.addunfinished()' for appending to the unfinishedstate list so as to keep 'merge' and 'bisect' at the last. This also makes two separate message formats for `checkunfinished()` and `getrepostate()` as there were previously present. Results of test changed are shown. Differential Revision: https://phab.mercurial-scm.org/D6503

state: moved cmdutil.STATES and utilities to state.py This commit moves `cmdutil.STATES` and adjoining functions to `state.py`. The existing users are updated accordingly. Tests remain unchanged. Differential Revision: https://phab.mercurial-scm.org/D6502

state: created new class statecheck to handle unfinishedstates For the purpose of handling states for various multistep operations like `hg graft`, `hg histedit`, `hg bisect` et al a new class called statecheck is created .This will help in having a unified approach towards these commands and handle them with ease. The class takes in 4 basic arguments which include the name of the command, the name of the state file associated with it , clearable flag , allowcommit flag. This also also adds the support of`checkunfinished()` and `clearunfinished()` to the class. Tests remain unchanged. Differential Revision: https://phab.mercurial-scm.org/D6501

states: moved cmdutil.unfinishedstates to state.py This moves `cmdutil.unfinishedstates`, `checkunfinished()`,`clearunfinished()` to `state.py`. the already existing users of this module are updated accordingly. Test results remain unchanged. Differential Revision: https://phab.mercurial-scm.org/D6484