StringView: use string-view-lite implementation

https://github.com/martinmoene/string-view-lite

* Add char_type hack for fmtlib to work in Player
* Add helper free functions
* Add install rules in lcf/third_party/string_view.hpp

Author: mateofio

CMakeLists.txt

@@ -283,6 +283,7 @@ set(LCF_HEADERS
 	src/generated/lcf/rpg/trooppage.h
 	src/generated/lcf/rpg/trooppagecondition.h
 	src/generated/lcf/rpg/variable.h
+	src/lcf/third_party/string_view.hpp
 )
 
 list(TRANSFORM LCF_SOURCES PREPEND ${CMAKE_CURRENT_SOURCE_DIR}/)
@@ -292,7 +293,7 @@ list(APPEND LCF_HEADERS ${CMAKE_CURRENT_BINARY_DIR}/src/lcf/config.h)
 target_sources(lcf PRIVATE ${LCF_SOURCES} PUBLIC ${LCF_HEADERS})
 
 # IDE source grouping
-foreach(SG LDB LMT LMU LSD RPG)
+foreach(SG LDB LMT LMU LSD RPG THIRD_PARTY)
 	string(TOLOWER ${SG} LSG)
 	source_group("Source Files\\generated\\${SG}" REGULAR_EXPRESSION "generated/${LSG}_.*\\.cpp")
 	source_group("Header Files\\generated\\${SG}" REGULAR_EXPRESSION "generated/lcf/${LSG}/.*\\.h")
@@ -389,7 +390,7 @@ install(
 	RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 
 set(LCF_INSTALL_HEADERS ${LCF_HEADERS})
-foreach(S ldb lmt lmu lsd rpg)
+foreach(S ldb lmt lmu lsd rpg third_party)
 	set(SUBDIR_HEADERS ${LCF_INSTALL_HEADERS})
 	list(FILTER SUBDIR_HEADERS INCLUDE REGEX "/${S}/")
 	install(FILES ${SUBDIR_HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/lcf/${S})

Makefile.am

@@ -21,6 +21,7 @@ lcflmtincludedir = $(includedir)/lcf/lmt
 lcflmuincludedir = $(includedir)/lcf/lmu
 lcflsdincludedir = $(includedir)/lcf/lsd
 lcfrpgincludedir = $(includedir)/lcf/rpg
+lcfthirdpartyincludedir = $(includedir)/lcf/third_party
 
 lib_LTLIBRARIES = liblcf.la
 liblcf_la_CPPFLAGS = \
@@ -300,6 +301,9 @@ lcfrpginclude_HEADERS = \
 	src/generated/lcf/rpg/trooppagecondition.h \
 	src/generated/lcf/rpg/variable.h
 
+lcfthirdpartyinclude_HEADERS = \
+	src/lcf/third_party/string_view.hpp
+
 nodist_lcfinclude_HEADERS = autogen/lcf/config.h
 
 check_PROGRAMS = test_runner