Refactored tools structure & conventions for reuse (#685)

1.  All common tools are hosted and managed in
    the tools directory (used for both local development
    and continuous integration)
2.  Each tool comprises a directory, akin to a bundle,
    that encapsulates declarative command-line options,
    configuration files and a run script
3.  A single bootstrap script configures a
    development environment
4.  A lightweight runtime provides a common set of
    convenience functions and variables to all scripts

References #672

.editorconfig

@@ -9,7 +9,7 @@ end_of_line = lf
 charset = utf-8
 
 # For all source code
-[*.{c,cpp,h,ino}]
+[*.{c,cpp,h,ino,sh}]
 insert_final_newline = true
 indent_style = tab
 indent_size = 2