Update UI elements

[andburn]

Mainly adding Hero images for portrait, weapon, hero power, and graphics for minion state.
I added the svg clip paths into the index.html, but I guess they'll have to be moved (didn't include page reference fix for firefox into url() in the css either).
Also, refactored the various art components and moved them to their own directory.

Elements:

• add icons for deathrattle,inspire,trigger,poison (Add character state graphics #7)
• add image for sleep Zzz image (Add Zzz when minions cannot attack #24)
• show armor on heros (Display armor on heroes #20)
• add image for frozen minions (Add character state graphics #7)
• add boad background for field section (partial Add basic UI zone delimitations #34)

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Points for me to address:

• move the hardcoded cardArtUrl into a property
• optimize the images
• fix secrets (not aligned properly)

[beheh]

Wow thanks, awesome! Looking into this.

[beheh]

Landed.