Work on #16
This was a relatively large amount of work. It introduces assets which
are stored in the assets sub directory and stored in the database with
the asset type in the database.
Due to bat also reading the $PAGER environment variable, I first look to
see if bat is available. If it is, I use that. If it isn't, I use the
$PAGER environment variable. If that's not available, I use cat.
I also added the --editor flag to the help output which had clearly been
missed
Close#12
This can be used when a file is modified externally. It will update the
sqlite database and potentially run git commands for the change.
If there are 2 files provided, it assumes that the file was moved. The
first filename should be the old file.
The new, edit and delete functions were also re factored slightly to use
this new update function.
Relevant to #4Close#2Close#1
This will list the tags along with the number of number of times it is
used.
An optional --noheader flag can be passed after the command to prevent
the header being printed.
e.g.
```
$ kb list-tags
name count
---------------- -----
Linux 2
Authentication 1
Pentesting 1
Enumeration 3
Network Protocol 2
```
```
$ kb list-tags --noheader
Linux 2
Authentication 1
Pentesting 1
Enumeration 3
Network Protocol 2
```
This --noheader flag was also added to the list command
Close#10
Jonathan Hodgson