Updated Upstream (Bukkit/CraftBukkit)

Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
6fac07e SPIGOT-6935: Make Arrow color nullable
abbc5c5 PR-730: Added a checkstyle rule to check for missing package declarations.
97157b1 PR-730: Added missing declaration of the org.bukkit.profile package.
9dcee1d PR-727: Fix typo in StriderTemperatureChangeEvent javadocs

CraftBukkit Changes:
1e87776 SPIGOT-6935: Make Arrow color nullable

Author: kennytv

patches/api/0001-Convert-project-to-Gradle.patch

@@ -99,10 +99,10 @@ index 0000000000000000000000000000000000000000..c76bfbcfbe034700bdbd9396643cfca6
 +}
 diff --git a/pom.xml b/pom.xml
 deleted file mode 100644
-index 9c130bf7fe7ec4b6b5d4f4c30cdbe6dc75b0f9a0..0000000000000000000000000000000000000000
+index 2bd4a47e18c0fb798d52d204a4315a889b0e64b4..0000000000000000000000000000000000000000
 --- a/pom.xml
 +++ /dev/null
-@@ -1,262 +0,0 @@
+@@ -1,263 +0,0 @@
 -
 -<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 -         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
@@ -330,6 +330,7 @@ index 9c130bf7fe7ec4b6b5d4f4c30cdbe6dc75b0f9a0..00000000000000000000000000000000
 -                        </executions>
 -                        <configuration>
 -                            <configLocation>checkstyle.xml</configLocation>
+-                            <suppressionsLocation>checkstyle-suppressions.xml</suppressionsLocation>
 -                            <includeTestSourceDirectory>true</includeTestSourceDirectory>
 -                        </configuration>
 -                        <dependencies>