Add calculator shortcut to foods tab

[erobinson]

Added the ability to bring up the bolus calculator from the food tab. This would allow users to quickly bolus for frequently consumed foods/meals. Working on making a more robust meal calculator where you can add foods & portions, etc. Wanted to create an initial PR for the small changes to get feedback and add initial enhancements.

Does not factor for fat/protein as discussed in #1106. May include in a future iteration.

After clicking the calculator icon on "soy milk"

#1105

[erobinson]

@MilosKozak - Hope you're doing well and had a great new year! I was wondering if there was anything I needed to do to merge this PR. Can rebase the changes onto to the top of dev & retest to be sure things are still working fine or anything else. Wasn't sure what the protocol was, if you wanted/needed me to do something, or if you hadn't seen the PR, etc.. Thanks in advance!

[erobinson]

Thanks @MilosKozak !