Table widget improvements

[bennothommo]

• Style read-only columns with slightly darker grey background to indicate read-only state
• Prevent editors from being created for all column types if read-only (previously, only string columns would be rendered read-only by setting the readonly attribute, this is not ideal because it can be easily changed)
• Allow tab and arrow navigation for read-only columns
• Make readOnly option case-insensitive
• Allowed searching option to show search box even if adding and deleting buttons are disabled
• Fixed styling of toolbar if only the search box is shown (no background previously)
• Fixed styling of pagination
• Fixed broken search if client datasource is used

In progress

• Add support for inspector column type for data tables - allowing support for complex values for individual table records (ie. an object). (will resubmit in another PR)

[bennothommo]

Before

After

[LukeTowers]

@bennothommo is this ready for review?

[bennothommo]

@LukeTowers everything except for the Inspector column type. I could strip that out and do that as another PR.

[LukeTowers]

@LukeTowers everything except for the Inspector column type. I could strip that out and do that as another PR.

@bennothommo let's do that then. Would like to release 1.2.8 in the next week.