Add labels and description tooltips in settings tab

[jwildfire]

Possible steps:

1. Create a metadata object capturing:

• chart(s) using the setting
• setting key
• option label
• option description
• expected type (numeric vs character)
• flag for data column mapping?
• flag for data field mapping?
• flag for required?

2. Create a getMetadata() function to pull the metadata from the object in V0.1.0 #1
3. Add meta data to the settings tab using the function in Warning appears in R console when widget renders #2

@jwildfire to cover 1 and 2. @bzkrouse to do 3.

[jwildfire]

Created #109 to handle the first 2 parts above. This issue will just cover the shiny implementation moving forward