Named and Positional Arguments

There are two types of arguments that may be defined: Named and Positional arguments.

Named arguments are those set off by short names or long names (such as -v or --verbose). They are optional (in that the parser will not show an error if one is not specified) unless explicitly marked as required and may be given in any order (eg. the parser does not care if you use -v --input file.txt or --input file.txt -v).
Positional arguments, on the other hand, are always required and must be given in the correct order (indicated by the Index property when defining the argument). Since they have a defined order, there is no need to tag them with short names or long names: just put them in the argument list and they will be parsed automatically.
While positional arguments are required to be given in order, they may be freely intermixed with named arguments. For example, the following are all valid ways to call the example above and will give the same output:
```
clipr.Sample.exe -v -v out.txt 2 3
clipr.Sample.exe out.txt -v -v 2 3
clipr.Sample.exe --verbose out.txt 2 -v 3
```
Since short arguments must be a single character, any short argument with an action that does not consume values (StoreConst, StoreTrue, StoreFalse, AppendConst, Count) may be combined together. -vvs is functionally the same as -v -v -s.
Similarly, short arguments with values may be input without a space between the flag and the first value (-fmyfilename.txt).