templater: process mapping dict by resource callables A resource item is a callable, so let's make it look up a resource object by itself.

templater: convert resources to a table of callables for future extension I'm going to add a full templating support to the annotate command. As the annotate is a filectx-oriented command, we'll need a way to look up a ctx from a bounded fctx only when necessary. This is the minimal change to support that. I'm thinking of defining a proper interface to look up template resources to fix other issues, but that isn't ready yet. (Changes from V1: just updated tests and patch descriptions.)

rebase: on abort, don't strip commits that didn't need rebased (issue5822) I clearly missed adding this condition in 78496ac30025 (rebase: allow rebase even if some revisions need no rebase (BC) (issue5422), 2017-05-11). Perhaps I should have opted for the "revdone" solution I mentioned there... Differential Revision: https://phab.mercurial-scm.org/D2879