Add pinstbuild parser

[ThePerkinrex]

Add a pinstbuild parser, which is like a makefile, but made for pinst
it will have the following actions

• mv <oldpath> <newpath>
• rm <path>
• run <command>
• download <url> <path>
• unpack <path>
• varname="vartextvalue"

---

And it will have multiple configurations:

• (default): run on all systems
• windows: run on windows
• unix: run on unix-like systems
• linux: run on linux
• osx: run on osx

---

and architecture dependent configs

• windows-arch
• linux-arch
  where arch can be:
• x86
• x86_64
• mips
• powerpc
• powerpc64
• arm
• aarch64

---

or the target triple as a config

• machine-vendor-operatingsystem

---

Example

version="v2.0.0"
download "https://commmon.download" "common.zip"
windows{
      download "https://windows$[version].download" "windows.zip"
      unpack "windows.zip"
}
unix{
      download "https://unix.download$[version]" "unix.tar"
      unpack "unix.tar"
}