Dynamic Menu and Image Capabilities

[Jack-Byrne]

Fixes #234

Based off of the additional sub menus pr.

[jacobkeeler]

An additional issue I ran into, it looks like the HMI will crash if an app is disconnected while on the menu screen. This is the error I get in such a case:

scheduler.production.min.js:96 Uncaught TypeError: Cannot read property 'menu' of undefined
    at Function.Pn [as mapToProps] (Menu.js:13)
    at r (wrapMapToProps.js:41)
    at selectorFactory.js:44
    at m (selectorFactory.js:58)
    at selectorFactory.js:63
    at e.d (connectAdvanced.js:64)
    at e.t.handleChangeWrapper (Subscription.js:95)
    at Subscription.js:23
    at el (react-dom.production.min.js:5919)
    at Object.notify (Subscription.js:19)

Some smaller comments still need to be addressed

[jacobkeeler]

Still seeing this issue for nested submenus: #285 (comment)

[NicoleYarroch]

I noticed when testing that images that are not templated do not show up in the menu even though they have been uploaded to core and I can see them in the storage folder. Scrolling does not make the non-templated images show up. The only way I can get the images to show up is to close the menu and re-open it. If I use templated images, everything seems to work as expected.