Add links to other README.md

Integrate costmap with DWB- Make robot move

* adding PR template

* removing empty template fields

* removing awkward HMTL tags for commented examples

Disabled getting the plugin list from parameters. Instead, it is
hard coded. The parameters are frequently not ready yet at the
time this call is made causing either a crash or just silently
not loading the plugins.

The transform buffer lifetime is part of the dwb controller. It
can't be managed by shared_ptr.

The limited acceleration controller derives from the standard
controller. By switching to the standard controller, we can
eliminate a bit of complexity while debugging.

Consistent package format

remove my fork used for geometry2 after upstream merge

Some of the packages used http://download.ros.org/schema/package_format2.xsd
that requires package format to be set to `2`, but package format was
set to 3 instead.

This change makes them consistent.  As a result linter for packages
won't compain on this error.  Version 3 picked up because it is superset of
version 2 with addition of optional fields.

fix broken build with nav2_costmap_world_model

adding client

tried uncrustrify reformatting

Revert "tried uncrustrify reformatting"

This reverts commit 921a71332f00284775bf7480e1b78624f35c92a9.