[mythtv] [PATCH] Make keycontexts hierarchical

[Joseph A. Caputo]

This patch introduces parent-child relationships in keycontexts.  The 
parent-child relationships are stored in a new table, "keycontexts", with the 
following structure:

+---------------+--------------+------+-----+---------+-------+
| Field         | Type         | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+-------+
| context       | varchar(32)  |      |     |         |       |
| description   | varchar(255) | YES  |     | NULL    |       |
| parentcontext | varchar(32)  |      |     | Global  |       |
+---------------+--------------+------+-----+---------+-------+

Only contexts for which an explicit parent exists need to be in this table; 
all other contexts have an implicit parent of "Global".  The following rows 
should be inserted at minimum:


mysql> select * from keycontexts;
+-------------------+-------------+-------------------+
| context           | description | parentcontext     |
+-------------------+-------------+-------------------+
| TV Playback       | NULL        | TV CommonPlayback |
| TV LivePlayback   | NULL        | TV CommonPlayback |
| TV CommonPlayback | NULL        | Global            |
+-------------------+-------------+-------------------+

This splits the existing "TV Playback" into 2 contexts, and collects common 
actions between the two into "TV CommonPlayback".  This further reduces the 
number of unique keybindings required, as LiveTV and normal Playback may now 
re-use more keys for different purposes.

It's late, and I haven't had time tonight to add the DB stuff to dbcheck, but 
I will if someone doesn't do it before I get to it (hopefully tomorrow).

-JAC

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