Add new study: Enright_2014

[yangsophieee]

Add study with seed storage location and fire response data (both resprouting and seedling recruitment) at the plot level after experimental fire treatments. The study also investigated density changes after fire, which I have not mapped.

A few things to flag for review:

• Not sure if I should transfer some of the site information from sampling_strategy to each location metadata
• I wasn't entirely sure what to name each of the new location properties so feel free to change anything (the details on what each column means is in the READMEs in the raw folder
• The code I used to join together the data is in the raw folder

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4a57b13) 80.20% compared to head (361ce52) 80.20%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #705 +/- ## ======================================== Coverage 80.20% 80.20% ======================================== Files 7 7 Lines 1531 1531 ======================================== Hits 1228 1228 Misses 303 303 ```

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