Implement Lua ALE setup & overhaul documentation

1. Add ale.setup and ale.setup.buffer for pure Lua configuration.
2. Update many global settings to use Booleans instead of numbers to
   make types easiert to work with in Lua.
3. Radically reformat documentation and fix errors to make
   documentation more usable for Neovim users.

doc/ale-solidity.txt

@@ -5,15 +5,21 @@ ALE Solidity Integration                                 *ale-solidity-options*
 ===============================================================================
 solc                                                        *ale-solidity-solc*
 
-g:ale_solidity_solc_executable                  *g:ale_solidity_solc_executable*
+                                         *ale-options.solidity_solc_executable*
+                                               *g:ale_solidity_solc_executable*
                                                 *b:ale_solidity_solc_executable*
+solidity_solc_executable
+g:ale_solidity_solc_executable
   Type: |String|
   Default: `'solc'`
 
   Override the invoked solc binary. For truffle/hardhat binaries.
 
-g:ale_solidity_solc_options                       *g:ale_solidity_solc_options*
+                                            *ale-options.solidity_solc_options*
+                                                  *g:ale_solidity_solc_options*
                                                   *b:ale_solidity_solc_options*
+solidity_solc_options
+g:ale_solidity_solc_options
   Type: |String|
   Default: `''`
 
@@ -36,6 +42,7 @@ solium                                                    *ale-solidity-solium*
   See the corresponding solium usage for detailed instructions
   (https://github.com/duaraghav8/Solium#usage).
 
+
 ===============================================================================
 forge                                                      *ale-solidity-forge*
 
@@ -46,5 +53,6 @@ forge                                                      *ale-solidity-forge*
   `foundry.toml`. See the corresponding documentation for detailed
   instructions (https://book.getfoundry.sh/reference/config/formatter).
 
+
 ===============================================================================
   vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl: