[WIP] Add create new database functionality

[jbyte]

Description (what is it you've done, has anything changed?)

Adds the create new database functionality.

• mysql#CreateDatabase(name, show) function that create a new database
• sqhell#CreateDatabase(name, show) generic function
• key mapping for SQHDatabase buffer
• SQHCreateDatabase command

Reasons for [WIP] (work in progress):

• uses the destroy and reopen "reload functionality" and would be better to first solve Extract SQL querys to seperate functions to enable easy reload of buffer contents on change #46
• throws an error when pressing e in SQHTable buffer that is fixed in Feature/insert row key #44

Checklist

• I have written my code in a way that it can be easily tested
• I have written tests for my code
• I have documented new features in doc/sqhell.txt
• I have added information to the README (where relevant)
• I have ran the automated tests and performed manual tests.