Remove using namespace from headers

[arkybruh7]

Description

Removed all using namespace declarations from header files and qualified the affected symbols explicitly.

Related ticket

closes #411 (improvement ticket)

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run --lockfile_mode=error //:license-check

Status: ⚠️ Needs Review

Click to expand output

[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.6.0) and connecting to it...
INFO: Invocation ID: 9b71a480-c980-4b8c-85ad-45c5b68d5b27
Computing main repo mapping: 
Computing main repo mapping: 
Loading: 
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Analyzing: target //:license-check (1 packages loaded, 0 targets configured)
Analyzing: target //:license-check (1 packages loaded, 0 targets configured)

Analyzing: target //:license-check (33 packages loaded, 10 targets configured)

Analyzing: target //:license-check (88 packages loaded, 10 targets configured)

Analyzing: target //:license-check (90 packages loaded, 10 targets configured)

Analyzing: target //:license-check (144 packages loaded, 2483 targets configured)

Analyzing: target //:license-check (158 packages loaded, 5891 targets configured)

Analyzing: target //:license-check (160 packages loaded, 9340 targets configured)

Analyzing: target //:license-check (170 packages loaded, 9395 targets configured)

Analyzing: target //:license-check (170 packages loaded, 9397 targets configured)

INFO: Analyzed target //:license-check (175 packages loaded, 11535 targets configured).
[8 / 16] Creating source manifest for @@score_tooling+//dash/tool/formatters:dash_format_converter [for tool]; 0s local
[13 / 16] JavaToolchainCompileClasses external/rules_java+/toolchains/platformclasspath_classes; 0s disk-cache, processwrapper-sandbox
[14 / 16] JavaToolchainCompileBootClasspath external/rules_java+/toolchains/platformclasspath.jar; 0s disk-cache, processwrapper-sandbox
INFO: Found 1 target...
Target //:license.check.license_check up-to-date:
  bazel-bin/license.check.license_check
  bazel-bin/license.check.license_check.jar
INFO: Elapsed time: 29.051s, Critical Path: 2.58s
INFO: 16 processes: 12 internal, 3 processwrapper-sandbox, 1 worker.
INFO: Build completed successfully, 16 total actions
INFO: Running command line: bazel-bin/license.check.license_check ./formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
       [-confidence <int>] [-ef <url>] [-excludeSources <sources>] [-help] [-lic
       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]

[danth]

Thanks for contributing. In order to proceed, you need to be covered by the necessary legal agreements.

This means having an Eclipse account linked to your GitHub account: https://eclipse-score.github.io/score/main/contribute/general/contribution_attribution.html

Then, sign the Eclipse Contributor Agreement within your Eclipse account.