Release awwan 0.2.0 (2020.07.05)

===  New features

*  environment: export the SSH key, user, host, and port

By knowing this values, user can use it to invoke other SSH related
command, for example to copy file using `scp`

  scp -i {{.SSHKey}} src {{.SSHUser}}@{{.SSHHost}}:{{.SSHPort}}/dst

*  all: add magic command "#require:"

Magic word `#require:` will ensure that the next statement will always
executed when its skipped with start number.
For example, given following script with line number

  1: #require:
  2: echo a
  3: echo b
  4: #require:
  5: echo c
```

executing `awwan local script.aww 3`, will always execute line
number 2 `echo a`, but not line number 5 (because its before line start
3).

===  Bug fixes

*  command: change the owner of file when doing #get!

In case the owner of file is not active user and it does not have
read permission, the "#get!" command will fail when copying command
from remote to local.

*  command: fix magic copy and get command on templates

===  Enhancements

*  command: merge sequences of spaces on command into single space

*  command: check for single, double, or back quote on command

Previously, if command contains quote like,

	echo "a b"

the script will run it as ["echo", `"a`, `b"`] which is not what we
will expected and may cause some command failed to run.

This changes fix the parsing of command string by detecting possible
quote.