String literals are being parsed, compiled and printed, read more

Strings, due to their potentially large size, are stored outside of a
routine's code section, in the data section. To access the correct
string, you must read the jump index, then the real address from the
jump table - and extra layer of indirection will result in more flexible
data down the road, I hope.

Other changes include:

* Added string concat operator ..
* Added TOY_STRING_MAX_LENGTH
* Strings can't be created or concatenated longer than the max length
* The parser will display a warning if the bucket is too small for a
  string at max length, but it will continue
* Added TOY_BUCKET_IDEAL to correspend with max string length
* The bucket now allocates an address that is 4-byte aligned
* Fixed missing entries in the parser rule table
* Corrected some failing TOY_BITNESS tests

.github/workflows/continuous-integration-v2.yml

@@ -37,7 +37,7 @@ jobs:
         if: matrix.commands.gdb == false || matrix.platforms.gdb_skip == false
         run: ${{ matrix.commands.exec }}
 
-  #TODO: hook this up to real script files
+  #TODO: hook this up to real script files, preferably in the test section
   run-test-repl-scripts:
     continue-on-error: true
     needs: run-test-cases
@@ -49,6 +49,7 @@ jobs:
           - { os: macos-latest }
         commands:
           - { build: make repl, run: out/repl.exe -f '../scripts/example.toy' }
+          - { build: make repl, run: out/repl.exe -f '../scripts/example-print.toy' }
     
     runs-on: ${{ matrix.platforms.os }}
     steps: