No more dependency ranges. No everything is same-major-version

src/dds/deps.cpp

 #include "./deps.hpp"
 
 #include <dds/error/errors.hpp>
+#include <dds/util/log.hpp>
 #include <dds/util/string.hpp>
 
+#include <boost/leaf/exception.hpp>
 #include <json5/parse_data.hpp>
 #include <semester/walk.hpp>
 
     }
 
     auto name = str.substr(0, sep_pos);
-
-    if (str[sep_pos] == '@') {
-        ++sep_pos;
+    if (str[sep_pos] != '@') {
+        static bool did_warn = false;
+        if (!did_warn) {
+            dds_log(warn,
+                    "Dependency version ranges are deprecated. All are treated as "
+                    "same-major-version. (Parsing dependency '{}')",
+                    str);
+        }
+        did_warn = true;
     }
-    auto range_str = str.substr(sep_pos);
 
+    auto range_str = "^" + std::string(str.substr(sep_pos + 1));
     try {
         auto rng = semver::range::parse_restricted(range_str);
         return dependency{std::string(name), {rng.low(), rng.high()}};

src/dds/deps.test.cpp

     };
 
     auto cur = GENERATE(Catch::Generators::values<case_>({
-        {"foo@1.2.3", "foo", "1.2.3", "1.2.4"},
-        {"foo=1.2.3", "foo", "1.2.3", "1.2.4"},
+        {"foo@1.2.3", "foo", "1.2.3", "2.0.0"},
+        {"foo=1.2.3", "foo", "1.2.3", "2.0.0"},
         {"foo^1.2.3", "foo", "1.2.3", "2.0.0"},
-        {"foo~1.2.3", "foo", "1.2.3", "1.3.0"},
-        {"foo+1.2.3", "foo", "1.2.3", semver::version::max_version().to_string()},
+        {"foo~1.2.3", "foo", "1.2.3", "2.0.0"},
     }));
 
     auto dep = dds::dependency::parse_depends_string(cur.depstr);