Improvement to @goal @glob

[xonixx]

In continuation of #34

New Design

In addition to proposed behavior in #34 let's also generate a root goal that also calls all child goals.
So:

@goal goal_name @glob *.txt 
 echo $ITEM $INDEX $TOTAL

Is eqivalent to

@goal goal_name
@depends_on goal_name@a.txt
@depends_on goal_name@b.txt

@goal goal_name@a.txt
 echo a.txt 0 2

@goal goal_name@b.txt
 echo b.txt 1 2

iff

$ ls
a.txt b.txt

@private

@private takes effect on all-goal only. Generated goals are aways private.

name

Name is not mandatory as now.

Without name let's use glob itself as a name (but only if it doesn't equal to a generated goal name)

@goal @glob *.txt 
 echo $ITEM $INDEX $TOTAL

Is eqivalent to

@goal *.txt
@depends_on a.txt
@depends_on b.txt

@goal a.txt
 echo a.txt 0 2

@goal b.txt
 echo b.txt 1 2

Child goals ordering

Let's make it natural sort order