don't move/resize if already moving/resizing

Fixes #102.  The "ideal" behavior might be to ignore buttons other than
the one being used for the action, but this is super-simple and still
seems reasonable.

Fullscreen: simplifications and fixes

Merges #69.

Merge pull request #91 from drdonahue/wip-tag-status-interface

Interface to display tag information on status bar

changed fprintf(stdout) instances to printf(), changed function name from statusbar to printstatus

Revert "remove sigchld function"

This reverts commit 1fa72b07728ebb396a9f236921b81c369bb12ccb.
Fixes #97.

remove sigchld function

Explicitly setting the handler for SIGCHLD to SIG_IGN tells the OS to
reap zombie processes automatically, which is what we wanted anyway.

added redirect from stdout to stderr for spawned processes to prevent conflicts with the statusbar outputs

Fixed tab formatting in 6 locations where statusbar() is called

Changed output to stdout instead of a file

updated output format for better expansibility and easier parsing

Revert "fix undeclared WLR_KEY_PRESSED"

This reverts commit 67896e9d8b98f679faf4456e26e82057c1884789.

Revert "remove EGL parameter from backend_autocreate"

This reverts commit 0ff13cf216056a36a261f4eed53c6a864989a9fb.

fix style on space-indented function

Removed unused variable from statusbar

added statusbar update when tags are updated

Added interface to output information about tags, the currently selected monitor, and the focused client to a file for use by a status bar

add some explanation of output reconfiguration

Hopefully this will help "future us" understand what's going on.

remove hacky code from output-management handler

This functionality belongs in updatemons(), where it can hopefully be
written a bit more elegantly.

commit entire output config, or fail and rollback

The wlr-output-management protocol requires that either all of the
changes from an apply request be applied successfully, in which case a
"succeeded" event is sent, or all of the changes are reverted and a
"failed" event is sent.  As written, this could partially commit
changes, then fail.

Test the changes first (even for an "apply" event), then commit or
rollback as appropriate.

Merge pull request #71 from djpohly/output-layout

call updatemons at the appropriate times