Signed-off-by: Max Riveiro <kavu13@gmail.com>

timeit shows a speedup of ~3x on Python 2.7.5 x86_64.
It also makes the code a bit shorter.

hacking/env-setup now adds the configured library path in ANSIBLE_CONFIG
to the ANSIBLE_LIBRARY environment variable in addition to the previous
default of ANSIBLE_HOME/library.

This replaces #5950.

If the CLI value for -a starts with an @, treat it like a file, and dump the contents into complex_args

This supports yaml or json.

Add note about how to submit doc changes to generated module docs, limit TOC depth for module category list.

Further modifications to the module formatter to adjust to the new theme, and some misc docs text corrections.

Rename "jpfunc" to something more explanatory

This fixes issue #5026. It used to work. The regression was
introduced in 2b3381de.

Code to limit display of version_added attributions in modules for modules that are too old to call out this information.

This does not generically apply to new arguments added to existing modules, just the version_added attribute on the top level modules.

Docs: Fix the module formatter code that is intended to remove the 'historical' variable from showing up in version_added information (RST)

raise errors when omitted, updated changelog with new modules.

Revert templating enhancements from 73dbab70 e6c28658 d409352c 9858b1f2 4587528b 9b1fe455 214b0b05 8d3db803 7f9504d1 5031104c 35cb9dc2 2bd8cb57 1e85c754

Enable imports to work on a snippet based system, allowing for instance a library of common EC2 functions
to be reused between modules.  See library/system/service and library/system/ping for initial examples.  Can
work the old way to just import 'basic', or can import the new way to import multiple pieces of code from
module_utils/.