fix #62 (toast now addressed relatively); macros=>procs + other fixes (#70)

* fixes https://github.com/genotrance/nimterop/issues/62
*  toast is now automatically built on demand, and doesn't depend on PATH
- [ ] todo: need to track its deps properly to trigger rebuilding it; using same algo as shown here https://github.com/genotrance/nimterop/issues/69 but using nim deps instead of c deps
* many other fixes
  * trying to follow https://github.com/timotheecour/vitanim/wiki/Nim-best-practices

.gitignore

@@ -3,7 +3,12 @@
 !/**/
 !*.*
 
-# TODO: all generated stuff should go inside `build/`
+
+# Notes:
+# all generated files should go inside `build/`
+# use absolute paths to refer to a path assumed to be at a fixed level in the hierarchy
+/build
+
 
 nimcache
 
@@ -12,6 +17,3 @@ nimcache
 *.exe
 *.swp
 
-# Note: use absolute paths to refer to a path assumed to be at a fixed dir level
-
-inc