Work on ps1 snippets (#1032)
Work on ps1 snippets (#1032)

* corrected placeholder numbers. Added two new snips

Numbered placeholders from 1 instead of 0 for proper order when pressing <Tab> added snips for export-csv and foreach

* added snippets

additional snippets for if..else, comment based help, and a switch statement

zachwhaley/vim-snippets,ToruIwashita/vim-snippets,phatograph/vim-snippets,honza/vim-snippets,vito-c/vim-snippets,kdankov/vim-snippets,ToruIwashita/vim-snippets,mjnicky/vim-snippets,phatograph/vim-snippets,rtorralba/vim-snippets,Ralph-Wang/vim-snippets,fran-penedo/vim-snippets,honza/vim-snippets,LogicalBricks/vim-snippets,sjewo/vim-snippets,rtorralba/vim-snippets,needle-wang/vim-snippets,fran-penedo/vim-snippets,mjnicky/vim-snippets,LogicalBricks/vim-snippets,adam-e-trepanier/vim-snippets,tinyheero/vim-snippets,tinyheero/vim-snippets,sjewo/vim-snippets,adam-e-trepanier/vim-snippets,needle-wang/vim-snippets,kdankov/vim-snippets,vito-c/vim-snippets,kevinkirkup/vim-snippets,craigp/vim-snippets,kevinkirkup/vim-snippets,Ralph-Wang/vim-snippets,craigp/vim-snippets,zachwhaley/vim-snippets