loading from the gallery ignores the new plugin extensions

[rbudde]

if a gallery program is selected, the matching plugin is loaded implicitly.
e.g. the selected plugin is ev3dev, a gallery program for spike is selected. The spike plugin is started with the gallery program loaded.

some time ago plugin extensions are added. The first is the 'neural network extension'. When a program from the gallery is loaded,
that is stored using this extension, the following error occurs:
when the gallery program is selected, the plugin is loaded, BUT the extension is ignored.

Example:

• xnn is a plugin with the 'neural network extension'. Select the plugin, load a xnn gallery program.
• the neural network is NOT shown.
• select the xnn plugin again from the start page.
• the neural network is shown

Solution:

the extension must be part of the program or part of the database storage.

Note:

a solution should be applied to the user stored programs, too. This is a smaller problem, as loading user programs do not switch plugins implicitly.