mergestate: remove unnecessary recordactions() from mergestate class This function is updating dirstate which sounds like not something which a method on mergestate class should do. Also this just calls another function. Lets directly call that function and remove this reducing mergestate responsibility a bit. There was single caller which is updated. Differential Revision: https://phab.mercurial-scm.org/D8737

mergestate: document mergestate records in an organized way This makes clear which mergestate record is used for what and group them based on how they are used right now. Differential Revision: https://phab.mercurial-scm.org/D8719

mergestate: remove unused unsupported related mergestate records I tried to find users of this but was unable to find. Seems like RECORD_OVERRIDE is doing for what they were used before. Differential Revision: https://phab.mercurial-scm.org/D8718

mergestate: add comments about couple of record types and minor reorder I am trying to divide the records into certain groups and then have dedicated objects for them. Taking baby steps in that direction. Differential Revision: https://phab.mercurial-scm.org/D8717

mergestate: remove unrequired RECORD_RESOLVED_OTHER record This was introduced in last cycle however while working on refactoring mergestate, I realized it's unncessary. This will break users who did a merge using previous version, did this kind of storage and before commiting updated the mercurial version. Differential Revision: https://phab.mercurial-scm.org/D8716

mergestate: rename addpath() -> addpathonflict() to prevent confusion addpath() seems to imply that we are adding a new path/entry to the mergestate. Differential Revision: https://phab.mercurial-scm.org/D8715