mod_development: add checkbox to enable or disable the development/recompile api.

(cherry picked from commit 0e702872345a282031ab7d155a056a71c05870ce)
mod_development: added request dispatching debug.
This shows the steps of the dispatcher in matching a dispatch rule, including all bindings, rewrites etc.

(cherry picked from commit 33a0e54b4157314f7eb6106ca5893dbfd8b17d17)
mod_development: add access control to the dispatch rule debugger.

(cherry picked from commit bdcea0020d3cb6b9994fc494a9089334e0dd910d)
mod_development: fix build of edoc.

(cherry picked from commit b7b2e15674397638a8b25f3740b58b6bd64532d7)
docs: add more mod_development documentation.

(cherry picked from commit 1ecf82f498f91c8fdf575564b8dcf20862e4d086)
mod_development: show final dispatch after #dispatch_rewrite.

(cherry picked from commit 3e38bab887f3596c430924705baec7cccc1251d1)
mod_development: add human-readable form for rewrite_nomatch. Always show the final dispatch.

(cherry picked from commit db011b838403ec9b579791f714e8b7d43d08903a)