remove some submodules, replacing them with hardcoded paths instead

.gitmodules

@@ -1,12 +1,3 @@
-[submodule "lib/brolib-sml"]
-	path = lib/brolib-sml
-	url = https://github.com/hummy123/brolib-sml
-[submodule "lib/cozette-sml"]
-	path = lib/cozette-sml
-	url = https://github.com/hummy123/cozette-sml
-[submodule "tests/Railroad"]
-	path = tests/Railroad
-	url = https://github.com/PerplexSystems/Railroad
 [submodule "test/Railroad"]
 	path = test/Railroad
 	url = https://github.com/PerplexSystems/Railroad

fcore.mlb

@@ -1,9 +1,8 @@
 $(SML_LIB)/basis/basis.mlb
 
 (* LIBRARIES (purely functional) *)
-lib/brolib-sml/src/line_gap.sml
-lib/brolib-sml/src/gap_set.sml
-lib/cozette-sml/fonts-with-z-index/cozette-ascii.mlb
+../brolib-sml/src/line_gap.sml
+../cozette-sml/fonts-with-z-index/cozette-ascii.mlb
 
 (* FUNCTIONAL CORE *)
 fcore/bin-search.sml