Remove use of hamcrest in production (non-test) code.

[dvlato]

No description provided.

[mikkokar]

The example plugin POM still needs to be fixed. This should do:

Index: plugin-examples/pom.xml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- plugin-examples/pom.xml    (date 1570783123000)
+++ plugin-examples/pom.xml    (date 1570784721897)
@@ -11,7 +11,6 @@
   <version>1.0-SNAPSHOT</version>
 
   <properties>
-    <main.basedir>${project.parent.basedir}</main.basedir>
     <java.source>1.8</java.source>
     <java.target>1.8</java.target>
 
@@ -20,6 +19,7 @@
     <rxjava.version>1.1.6</rxjava.version>
     <jackson.version>2.9.10</jackson.version>
     <testng.version>6.14.3</testng.version>
+    <hamcrest.all.version>1.3</hamcrest.all.version>
   </properties>
 
   <dependencies>
@@ -60,6 +60,20 @@
       <version>${testng.version}</version>
     </dependency>
 
+    <dependency>
+      <groupId>org.hamcrest</groupId>
+      <artifactId>hamcrest-all</artifactId>
+      <version>${hamcrest.all.version}</version>
+      <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <groupId>org.slf4j</groupId>
+          <artifactId>slf4j-api</artifactId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+
+
   </dependencies>
 
   <build>

[mikkokar]

Let's get rid of this class. You can just copy the changes from my closed PR: #478.