Improved Upgrade Indicators and Management

When upgrading my items I run into a couple of issues.

1. Sometimes I click on items and whether or not they can be upgraded is misleading. For instance, let's say I'm Town Hall 8. I have my Skeleton Trap upgraded to Level 2. I click it and see the upgrade button suggesting to me it can be upgraded. However, if I click on upgrade it tells me it can't be upgraded until Town Hall 9. This happens with other items too and it's very annoying.
2. I can't remember which items require upgrading. Walls are easy to identify, but other items have very subtle differences from level to level. For instance, collectors or archer towers. I find I have to click around to each item to determine if it can be upgraded or not. This can be a little annoying when you have a large base.

To solve both it seems relatively easy.

For #1, the upgrade button should be disabled in a way that advises you there are no more upgrades for your town hall. This will help avoid making people click around more than they need to.

For #2, for items except for walls, add some symbol - maybe an up arrow - to indicate that this item has the ability to be upgraded. This will save people time. It will automatically be understood which items can be upgraded.

Thanks for your consideration.