minor modules/git improvements through more config options

[tadeaspaule]

Added the following config fields for modules/git:

sections         []interface{} `help:"Sections to show" optional:"true"`
showModuleName   bool          `help:"Whether to show 'Git - ' before information in title" optional:"true" default:"true"`
branchInTitle    bool          `help:"Whether to show branch name in title instead of the widget body itself" optional:"true" default:"false"`
showFilesIfEmpty bool          `help:"Whether to show Changed Files section if no changed files" optional:"true" default:"true"`
lastFolderTitle  bool          `help:"Whether to show only last part of directory path instead of full path" optional:"true" default:"false"`

[tadeaspaule]

Hi @senorprogrammer is this ok to merge?

(forgot to mention, I set the default values so that if the user doesn't change anything, everything looks as it did before this PR)

[senorprogrammer]

Yep, looks great. Merged.