Bumped version to 4.7.0

[jonbartels]

Pull in updates to get ready for 4.7.0.

Follows #301 (the 4.6.0 bump), adapted to the post-Gradle-migration layout: server/mirth-build.properties is gone, so gradle.properties carries the build version now, and server/src/test/resources/mirth.properties is a new place the version appears.

Changes

• gradle.properties — build version 4.6.0 → 4.7.0
• server/conf/mirth.properties, server/src/test/resources/mirth.properties — migration version
• server/dbconf/{derby,mysql,oracle,postgres,sqlserver}/*-database.sql — SCHEMA_INFO seed version
• tools/install4j/oie-installer-config.install4j — installer <application version="...">
• server/src/com/mirth/connect/client/core/Version.java — appended v4_7_0("4.7.0"); v4_6_0 stays as history since getLatest() returns the last constant
• server/src/com/mirth/connect/server/migration/ServerMigrator.java — case v4_7_0: return null;

No Migrate4_7_0 is added, matching how #301 handled 4.6.0 — 4.7.0 ships no schema change beyond the SCHEMA_INFO version row. If a config/schema migration turns out to be needed, it belongs in its own PR.

ci/tests/*/channels/*/channel.xml fixtures are deliberately left at version="4.6.0": they are channel exports, not version declarations, so leaving them keeps CI exercising the import/upgrade path from the prior release. #301 likewise did not touch fixtures.

Verification

• ./gradlew :server:compileJava — passes
• ./gradlew :server:test — 667 tests, 0 failures. This covers the bump-sensitive tests: those initializing ObjectXMLSerializer from Version.getLatest() (ObjectXMLSerializerTest, ObjectJSONSerializerTest, MapUtilTest, HttpReceiverPropertiesTest, JsonMessageBodyReaderTest, ServerConfigurationRestorerTest) and the migration tests calling setStartingVersion(Version.getLatest()) (Migrate3_7_0Test, Migrate4_0_0Test, Migrate4_3_0Test).
• xmllint --noout tools/install4j/oie-installer-config.install4j — parses
• git grep '4\.6\.0' -- . ':!ci/tests' — only the retained v4_6_0 enum constant remains

🤖 Generated with Claude Code

[github-actions]

Test Results

128 files  ±0  128 suites  ±0   3m 59s ⏱️ +57s
729 tests ±0  729 ✅ ±0  0 💤 ±0  0 ❌ ±0 
819 runs  ±0  813 ✅ ±0  6 💤 ±0  0 ❌ ±0 

Results for commit a750221. ± Comparison against base commit bb3e5b2.

[tonygermano]

Approving, but next time let's skip the install4j file. That's a separate PR and this creates a merge conflict with the edits in progress.