Rewrite, again (#98)

Closes #87 
Closes #84 
Closes #67 

- [x] walk
- [x] process
- [x] sync
  - [x] cloud
  - [x] studio
  - [x] debug
- [x] existing assets support 
- [x] codegen
- [x] upload
- [x] upload command
- [x] migrate from old asphalt lockfile command
  - need to consider inputs
- [x] update readme
- [x] Test on Windows to see if I messed up any path stuff

Deferred until final release
- migrate tarmac manifest command
- init command

Deferred to the next update:
- image packing

Author: jackTabsCode

.gitignore

@@ -3,7 +3,7 @@
 /input
 /output
 asphalt.lock.toml
-.env
+.env*
 asphalt.toml
 .DS_Store
 .asphalt-debug/