[infra] remove seqan3 dependency and submodule

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "submodules/seqan3"]
-	path = submodules/seqan3
-	url = ../../seqan/seqan3.git

build_system/biocpp_io-config.cmake

@@ -171,20 +171,6 @@ else ()
     endif ()
 endif ()
 
-# ----------------------------------------------------------------------------
-# Require SeqAn3
-# ----------------------------------------------------------------------------
-
-find_package (SeqAn3 REQUIRED QUIET
-              HINTS ${CMAKE_CURRENT_LIST_DIR}/../submodules/seqan3/build_system)
-
-if (SEQAN3_FOUND)
-    bio_config_print ("Required dependency:        SeqAn3 found (${SEQAN3_VERSION}).")
-    set (BIOCPP_IO_LIBRARIES ${BIOCPP_IO_LIBRARIES} seqan3_seqan3)
-else ()
-    bio_config_print ("The SeqAn3 library is required, but wasn't found. Get it from https://github.com/seqan/seqan3")
-endif ()
-
 # ----------------------------------------------------------------------------
 # ZLIB dependency
 # ----------------------------------------------------------------------------

include/bio/io/platform.hpp

@@ -43,15 +43,6 @@ static_assert(__cplusplus >= 201709, "The BioC++ I/O library requires C++20, mak
 #    error The BioC++ I/O library include directory is not set correctly. Forgot to add -I ${INSTALLDIR}/include to your CXXFLAGS?
 #endif
 
-// SeqAn3 [required]
-#if __has_include(<seqan3/version.hpp>)
-#    include <seqan3/version.hpp>
-static_assert(seqan3::seqan3_version_major == 3, "SeqAn >= 3.1 is required by the BioC++ I/O library.");
-static_assert(seqan3::seqan3_version_minor >= 1, "SeqAn >= 3.1 is required by the BioC++ I/O library.");
-#else
-#    error The SeqAn3 library was not included.
-#endif
-
 // ============================================================================
 //  WORKAROUNDS
 // ============================================================================

test/snippet/CMakeLists.txt

@@ -26,8 +26,8 @@ macro (biocpp_snippet test_name_prefix snippet snippet_base_path)
     set (target "${snippet_target_name}_snippet")
 
     add_executable (${target} "${snippet_base_path}/${snippet}")
-    target_link_libraries (${target} PUBLIC snippet_main biocpp::io fmt::fmt-header-only seqan3::seqan3)
-    target_compile_options (${target} PUBLIC -Wno-unused -Wno-interference-size) # TODO: remove the latter
+    target_link_libraries (${target} PUBLIC snippet_main biocpp::io fmt::fmt-header-only)
+    target_compile_options (${target} PUBLIC -Wno-unused)
     set_target_properties(${target}
         PROPERTIES
         RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/${snippet_target_path}"

test/unit/CMakeLists.txt

@@ -25,8 +25,7 @@ macro (bio_test unit_test_cpp)
     biocpp_test_component (test_name "${unit_test}" TEST_NAME)
 
     add_executable (${target} ${unit_test_cpp})
-    target_link_libraries (${target} biocpp::test::unit biocpp::io seqan3::seqan3)
-    target_compile_options (${target} PUBLIC -Wno-interference-size) # TODO(bio): remove the latter
+    target_link_libraries (${target} biocpp::test::unit biocpp::io)
     if (BIOCPP_IO_VERBOSE_TESTS)
         gtest_discover_tests(${target} TEST_PREFIX "${test_name}::" PROPERTIES TIMEOUT "30")
     else ()