[daap/rsp/smartpl] Drop ANTLR parsers

Replacing the antlr parsers solves multiple issues:

- Build warnings (issue #307)
- Build hacks: "-Xconversiontimeout 30000" and other Makefile magic
- Incorrect parsing of daap queries with sql wildcards (like 'tag:*tes%t_ng*')
- Infinite recursion/memory/CPU (issue #570 and #1248)
- systemd service file workarounds due to memory/CPU issue
- ANTLR3 being replaced with ANTLR4 (that doesn't support C file generation)
- Runtime dependency on antlr library
- Difficult installs of ANTLR3 on some systems (special install script)

configure.ac

@@ -27,22 +27,10 @@ AS_IF([[test -z "$GPERF"]],
 		AC_MSG_NOTICE([[
 
 GNU gperf not found, but it's output appears to be present.
-If you modify any gperf or ANTLR grammar files (.g), you will need
-to install it.]])],
+If you modify any .gperf files, you will need to install it.]])],
 		[AC_MSG_ERROR([[GNU gperf required, please install it.]])])
 	])
 
-AC_PATH_PROG([ANTLR], [[antlr3]])
-AS_IF([[test -z "$ANTLR"]],
-	[AS_IF([[test -f "$srcdir/src/SMARTPLLexer.h"]],
-		[AM_MISSING_PROG([ANTLR], [[antlr3]])
-		AC_MSG_NOTICE([[
-
-antlr3 not found, but it's output appears to be present.
-If you modify any ANTLR grammar files (.g), you will need to install it.]])],
-		[AC_MSG_ERROR([[antlr3 wrapper required, please install it.]])])
-	])
-
 dnl Enable all warnings by default.
 AM_CPPFLAGS="-Wall"
 AC_SUBST([AM_CPPFLAGS])
@@ -174,16 +162,6 @@ PKG_CHECK_EXISTS([libplist],
 	[OWNTONE_MODULES_CHECK([OWNTONE], [LIBPLIST], [libplist-2.0],
 		[plist_dict_get_item], [plist/plist.h])])
 
-
-OWNTONE_FUNC_REQUIRE([OWNTONE], [ANTLR3 C runtime], [ANTLR3C], [antlr3c],
-	[antlr3BaseRecognizerNew], [antlr3.h],
-	[AC_CHECK_FUNC([[antlr3NewAsciiStringInPlaceStream]],
-		[AC_DEFINE([ANTLR3C_NEW_INPUT], 0,
-			[define if antlr3 C runtime uses new input routines])],
-		[AC_DEFINE([ANTLR3C_NEW_INPUT], 1,
-			[define if antlr3 C runtime uses new input routines])])
-	])
-
 AM_PATH_LIBGCRYPT([1:1.2.0])
 OWNTONE_FUNC_REQUIRE([OWNTONE], [GNU Crypt Library], [LIBGCRYPT], [gcrypt],
 	[gcry_control], [gcrypt.h])