Update manifest.xml logic to parse semantic XML (Trac #2225)

[elgg-gitbot]

Original ticket http://trac.elgg.org/ticket/2225 on 40385844-09-07 by brettp, assigned to unknown.

Elgg version: Github Master

Currently manifest.xml is in the format:

<field key="name1" value="value1" />
<field key="name2" value="value2" />

I propose using semantic XML instead:

<name1>value1</name1>
<name2>value2</name2>

If this goes in 1.8, we will need to provide backward compatibility with the original format.

[elgg-gitbot]

brettp wrote on 40773988-12-13

While we're making manifest changes like #2170 and #1986 we should add this.

[elgg-gitbot]

brettp wrote on 40914964-04-16

(In [svn:7481]) Refs #1986 #2170 #2225 Added ElggPluginManifest, ElggPluginManifestParser, and its parser classes for 1.7 and 1.8 style manifests. Changed load_plugin_manifest() to use new parser. Added initial unit tests.

[elgg-gitbot]

brettp wrote on 40923092-11-11

(In [svn:7512]) Refs #1986 #2170 #2225. Added semantic manifest.xml support and unit tests. Also added plugin dependencies system. See engine/tests/test_files/plugin_18/manifest.xml for examples. Not closing tickets pending discussion.

[elgg-gitbot]

brettp wrote on 41007489-12-15

(In [svn:7817]) Fixes #1986, #2170, #2225, #2759. Integrated ElggPluginPackage and ElggPluginManifest with ElggPlugin. System now uses ElggPlugin objects to determin plugins. Order is stored in private settings. This absolutely requires running upgrade.php.