Add UI for specifying CMake tools and generators locations

Adding UI into CMake Preference page that allow user to specify the
location of the CMake tool and the location of CMake generators.

Addresses Issue: CDT CMake Improvements #1000, IDE-82683-REQ-004 and
IDE-82683-REQ-005

Author: DangMinhTam382

cmake/org.eclipse.cdt.cmake.ui/src/org/eclipse/cdt/cmake/ui/internal/CMakePreferencePage.java

@@ -257,6 +257,7 @@ public void modifyText(ModifyEvent evt) {
 			} catch (IOException e1) {
 				MessageDialog.openError(getShell(), Messages.CMakePreferencePage_FailToTestCmakeLocation_Title,
 						Messages.CMakePreferencePage_FailToTestCmakeLocation_Body + e1.getMessage());
+				Activator.log(e1);
 			}
 		});
 
@@ -392,7 +393,7 @@ private String resolveVariableValue(String value) {
 			ICdtVariableManager vm = CCorePlugin.getDefault().getCdtVariableManager();
 			return vm.resolveValue(value, null, "", null); //$NON-NLS-1$
 		} catch (CdtVariableException e) {
-			e.printStackTrace();
+			Activator.log(e);
 		}
 		return null;
 	}