Base: Quantity: rename lexer and parser files

Rename files according 7d233dc ("Gui: Rename generated lexer files
to match core naming pattern"). Note that C space errors (space
before tabs, spaces on blank lines, etc.) still need to be fixed
manually after regenerating lexer file.

src/Base/Parser.sh

@@ -1,2 +1,6 @@
-flex -oQuantityLexer.c < QuantityParser.l
-bison -oQuantityParser.c QuantityParser.y
+(cd "$(dirname "$0")" && \
+  flex -oQuantity.lex.c Quantity.l && \
+  bison -oQuantity.tab.c Quantity.y && \
+  sed -i '1s|^|// clang-format off\n|' Quantity.tab.c && \
+  sed -i '1s|^|// clang-format off\n|' Quantity.lex.c \
+)